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smart card.....or Xphone card circuit

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New Member
well....i am not sure this is possible...
but i want to make a smart card lock....i mean i want to store a code into a smart card and then be able to use the smart card to open somthing.
the only smart cards i can think of is to use phone cards wich don't have credit on them any more..and are also expired...
so how should i do that?
the way i think is to place a code into the card ...and then read that code..and compare it with a stored code and open the lock....
any ideas?


Active Member
There are also gold-cards, look exactly like a smartcard (but golden :)).
They are used to descramble DVB sattelite transmissions. They contain a PIC16F84 and an EEPROM, so if you know pic programming, these things could do the trick.



Active Member
All phone card have different serial number. If You can read these number, the card quite enough for this application.(also without credit.)


New Member
yes il like the idea with the serial number.
i assume that it is unique.
so i don't have to worry about putting the number inside it..
but i still have a bit of a problem....
some cards have 6 contacts some have 8......
i think that the 8 contacts' are older....
i got 2 from 2000(the year)


New Member
Atmel has a Smart Card Development Kit that you can get from insight electronics(~$200 I think). I think you can buy just the micro with Smart Card interface from the same place if you cant afford the kit. I think the part number of the micro is AT83C5123.

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